Wet detention pond - Channel protection / water quality outlet configuration Wet detention pond - Channel protection / water quality outlet configuration

Wet detention pond - Channel protection / water quality outlet configuration
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	Design methodology
	1-yr 24-hr Instantaneous volume	1-yr 24-hr routed (R124)	1/2 Pre-development 2-yr 24-hr peak Instantaneous volume	1/2 Pre-development 2-yr 24-hr peak routed (R224)
Orifice diameter (inches)	10.5	6.9	10.0	11.6
Oriface elevation (ft)	105.0	105.0	105.0	105.0
Surface area at orifice elevation (ac)	0.6	0.6	0.6	0.6
Peak discharge per design event (cfs)	6.4	2.1	5.8	5.8
Peak water elevation per design event (ft)	107.9	108.2	108.7	108.5

Note that the routed method for the 1-year design (R124) is much less than the Instantaneous volume due to the more constricted orifice.